Improvement in flour-bolts



.Quint tatrs atnut ffice.

WILLIAM CRAIG, OF UVNIONTOWN, PENNSYLVANIA.

Letters Patent No. 73,167, dated January 7, 1868.

IMPROVEMENT IN FLOUR-BOLTS.

TO ALL WHOM IT MAY CONCERN:

Be it known that l', WILLIAM CRAIG, of Uniontown, in the'county ofFayette, and State of Pennsylvania,

have invented a new and improved Flour-Bolt; and I do hereby declarethat the following is a full, clear, and exact description thereof,which will enable others skilled in the art to make and use the same,reference being had to the accompanying drawings, forming part of thisspecication, in Which- Figure lis a vertical longitudinal section of myimproved ilouring-mill, taken in the plane of the line z z, fig. 2. i

Figure 2 is a. plan, with some portions of the mill removed lto exhibitthe interior arrangement of the elevators and double bolting-cloths. v

Figure 3 is a transverse section of the bolting-chest, taken in the lineyy, iig. 1.

Similar letters of reference indicate like parts. i I

This invention relates to an improved flour-bolt in a portableonring-mill, and consists of two hexagonal cloths, arranged one withinthe other on the same reel, and separated by a. close partition-cloth,as will be hereinafter more fully described The general arrangement of aportablesmill is also shown, to which my improved bolt is applied. n

Two run ofthirty-six inch burr-stones are set sideby side, as shown inplan, fig. V2. The upper stone, A, is made stationary, and the lowerstone, A', is the runner.v They are to be set in cast-iron frames, andthe lower one supported by an iron plate. The hoppers B are arranged inthe ordinary way. The stones are both operated directly by onehorizontal spur-wheel, a, which is placed between` them, below on theshaft al, and gears into pinons, a2, on the spindles. On the shaft a1 isplaced a pulley, b, to be connected by a belt with a drivingpulleyoperated by steam or water-power. Under the 'main wheel a, on the sameshaft, is placed bevel-wheel, e, gearing into the bevel e on the shaftf, which passes horizontally through the bottom of the elevator-box Z,containing double flour-elevators; The shaft f extends beyond theelevator-box Z, and carries the long screwconveyor C; and on its outerextremity is placed a bevel-wheel, g, which gears into-the'bevel g onthe vertical shaft h, carrying the bevel-gear z' i, for operating theconveyor D directly, and the short conveyor E above, by means ofcog-gear k. k. The shaft h also operates the bolting-apparatus, by meansof cog-gear l on its upper end, and Z on the shaft F of the bolt-reel m.

The double elevatorsjn the trunk Z are constructed in theusual Way. n nare the'elevators or belts, provided with buckets, and running over therollers s s at the upper end, and t t at the lower end, on the shaft f.The double elevators are separated by a-partition, u. They receive theflour from the two run of stones by separate spouts, u1 u2, and deliverit, by separate spouts, 'a3 u, into separate bolting-cloths, throughthehead m2 of the chest G. v i

My improved bolting-apparatus consists of two hexagonal cloths,arranged, onewithin another,- on the same reel, m. 'u is the inside and'v1 the outside bolting-cloth, separated by a close partition-cloth, v,al1 of which are fastened to the reel by ribs, m1, and are soconstructed and arranged that the outside and inside bolting-clotbsshall receive the flour separately from the double elevators, anddeliver it, as bolted, into separate division'sor compartments of thebolting-chest, according 'to the different qualities orv grades of flourand bran. The bolting-cloths 'v 111 are secured to the reel m by-placingthe ribs ml on the outsideinstead o f the inside, as

usual, giving a continuous smooth surface on the inside of the bolts, sothat the flour slides from one end to the,

other without interruption, carrying thevbran along smoothly'in front,instead of being raisedand thrown down by the ribs when placed on theinside, as usual. which forces tine particles ofbran through the cloth,and specks thc flour.

The inside bolting-cloth 11 extends from end to end of the chest G, theboltedilour of finest quality falling` upon the partition-cloth v2,which delivers it'intothe transverse compartment H in the chest G, whilethe next lower grade of flour falls into the compartment I, and the branfalls from the outer end into the compartment K.

The outside bolting-cloth c is shorter than the partitionclotl1 v'i, andthe finer flour falls 'directly into the .large compartment M, while thebran falls from'thc end of the bolting-clothinto the compartment L.

'.lhe compartments K L are provided with side spears. 1u w, fordischarging the bran, and the chamber with the spout wl, for theinferiorflour.

lhe compartment H, which receives the tine flour from the insidehalting-cloth c, opens into the box of the short 'conveyor E, which isprovided with zt spout to discharge the our by itself, when desired, andalso with :t trap-slide to discharge it into the box of the conveyor D,to mix it with the Flour from the outside bolting-clotli v1.

Both run of stones may thus grind grain of one kind, or two kinds ofgrain may he grounfl at the sztm'e time on seperate stones, and the iourkept separate.

The conveyor D is provided with spouts, wz, in the usual Way, fordischarging different grades of ilour, and also With return-spouts, w3,which discharge int-o the bex ofthe longr conveyor C, by which theeoarser lour is conducted to the elevator, to be carried by it to thebolting-nppavrzttus to be reboltefl.

I do not claim the separate parts of my device as new in themselves, but

I do claim the bolt, constructed as described, having the partition v2between the outer and inner holtingcloths v el, operating substantiallyas clescriheclfor the purpose speced.

WILLIAM CRAIG.

Witnesses:

ALEXR MCLEAN, L. STEWART.

